Deployment strategy

[creepone]

To be able to deploy new versions of the app rapidly, it would be helpful to have some automated process / script that could be hooked to some events (like push into the github repository), scheduled or triggered manually. It would simply copy the new version of the app onto the web server (currently this means pushing the changes into the heroku remote, we could solve it in a similar way by having a remote clone of the repository on the web server), upgrade the database structure / data if necessary (see Issue #4) and restart the application.